Crossword Genius

Puzzling mystery (6)

Ross

I believe the answer is:

enigma

'puzzling mystery' is the definition.
'enigma' can be an answer for 'mystery' (synonyms). I also know that 'puzzling' relates to this answer.

This is the entire clue.

(Other definitions for enigma that I've seen before include "Riddle - German coding machine" , "Title of Elgar's set of variations" , "WW2 code" , "closed book" , "Mysterious puzzle" .)

I've seen this clue in The Times.
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